A prohormone is something that will basically boost that particular hormone level. Testosterone is the main prohormone their is because so many men wish to have the benifits of having more test in their bodies. However the pros out number the cons it this situation, the cons outweigh the pros. Any time that you manipulate a hormone, there is always another hormone that will also raise in order to regain balance in your system. Either way using them is bad.

For example a testosterone supplement will indeed raise your test levels, giving you the benift of a larger penis, more facial and body hair, more energy, fat loss, the ability to easily gain muscle, etc. However the main con is the fact that with taking a test booster, your estrogen which is the yang in the ying/yang balance of hormones, will ultimatley rise as well. And once you stop taking the test, and yes eventually your body will adapt to the supplement and either way you will stop developing it, your estrogen will take a very long time to come back down to being balanced out to your natural levels of testosterone.

The outcome in this scenario, man boobs, or the actual term, gynecomastia. And also your natural testosterone levels can be decreased and there goes your natural abilities of fat loss, muscle gain, and sex drive. Basically the opposite of what you were normally striving for.